Empathy List Archives

SR

Sam Reaves

Mon, Mar 31, 2014 2:04 PM

I have a HP3455A that by all appearances has lost its cookies perhaps due
to bad ROMS. Does anyone have these rom images and a procedure to
replace/refresh them?

Sam
W3OHM

I have a HP3455A that by all appearances has lost its cookies perhaps due to bad ROMS. Does anyone have these rom images and a procedure to replace/refresh them? Sam W3OHM

TM

Tom Miller

Mon, Mar 31, 2014 3:37 PM

KO4BB.com has the images for the 3455A.

Here:
http://ko4bb.com/manuals/index.php?dir=04)_ROM_Images_and_Drivers/HP_3455A

Regards,
Tom

----- Original Message -----
From: "Sam Reaves" sam.reaves@gmail.com
To: volt-nuts@febo.com
Sent: Monday, March 31, 2014 10:04 AM
Subject: [volt-nuts] 3455A ROMS

I have a HP3455A that by all appearances has lost its cookies perhaps due
to bad ROMS. Does anyone have these rom images and a procedure to
replace/refresh them?

Sam
W3OHM

volt-nuts mailing list -- volt-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.

KO4BB.com has the images for the 3455A. Here: http://ko4bb.com/manuals/index.php?dir=04)_ROM_Images_and_Drivers/HP_3455A Regards, Tom ----- Original Message ----- From: "Sam Reaves" <sam.reaves@gmail.com> To: <volt-nuts@febo.com> Sent: Monday, March 31, 2014 10:04 AM Subject: [volt-nuts] 3455A ROMS >I have a HP3455A that by all appearances has lost its cookies perhaps due > to bad ROMS. Does anyone have these rom images and a procedure to > replace/refresh them? > > Sam > W3OHM > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there.

TG

Tony Greene

Wed, Apr 2, 2014 2:13 AM

I have been troubleshooting a HP3456A voltmeter.

Its giving a stange fault, but I beleive I have nailed it down. The unit is reading +10.00000 volts input at +9.99661 volts. If you reverse the input, it reads correct at -10.00000 volts. All other ranges read correct on either polarity.

What I need is a source for the FET A20 Q109 or a suitable substitute. Its HP part number 1855-0298, it was made originally by USA mfg 02883 - Siliconix, Inc, Santa Clara, CA. It crosses to NSN 5961-01-135-1324. And Vishay has bought them and the part number is now obselete.

FREE 3D EARTH SCREENSAVER - Watch the Earth right on your desktop!
Check it out at http://www.inbox.com/earth

I have been troubleshooting a HP3456A voltmeter. Its giving a stange fault, but I beleive I have nailed it down. The unit is reading +10.00000 volts input at +9.99661 volts. If you reverse the input, it reads correct at -10.00000 volts. All other ranges read correct on either polarity. What I need is a source for the FET A20 Q109 or a suitable substitute. Its HP part number 1855-0298, it was made originally by USA mfg 02883 - Siliconix, Inc, Santa Clara, CA. It crosses to NSN 5961-01-135-1324. And Vishay has bought them and the part number is now obselete. ____________________________________________________________ FREE 3D EARTH SCREENSAVER - Watch the Earth right on your desktop! Check it out at http://www.inbox.com/earth

OE

Orin Eman

Wed, Apr 2, 2014 2:52 AM

Why not get one from Tucker?

http://www.etestparts.com/Search.aspx?Search=1855-0298

Sphere have them as well:

http://www.sphere.bc.ca/test/hp-parts/hpparts4.html

Orin.

On Tue, Apr 1, 2014 at 7:13 PM, Tony Greene tonygreen924@inbox.com wrote:

I have been troubleshooting a HP3456A voltmeter.

Its giving a stange fault, but I beleive I have nailed it down. The unit
is reading +10.00000 volts input at +9.99661 volts. If you reverse the
input, it reads correct at -10.00000 volts. All other ranges read correct
on either polarity.

What I need is a source for the FET A20 Q109 or a suitable substitute.
Its HP part number 1855-0298, it was made originally by USA mfg 02883 -
Siliconix, Inc, Santa Clara, CA. It crosses to NSN 5961-01-135-1324. And
Vishay has bought them and the part number is now obselete.

FREE 3D EARTH SCREENSAVER - Watch the Earth right on your desktop!
Check it out at http://www.inbox.com/earth

volt-nuts mailing list -- volt-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.

Why not get one from Tucker? http://www.etestparts.com/Search.aspx?Search=1855-0298 Sphere have them as well: http://www.sphere.bc.ca/test/hp-parts/hpparts4.html Orin. On Tue, Apr 1, 2014 at 7:13 PM, Tony Greene <tonygreen924@inbox.com> wrote: > I have been troubleshooting a HP3456A voltmeter. > > Its giving a stange fault, but I beleive I have nailed it down. The unit > is reading +10.00000 volts input at +9.99661 volts. If you reverse the > input, it reads correct at -10.00000 volts. All other ranges read correct > on either polarity. > > What I need is a source for the FET A20 Q109 or a suitable substitute. > Its HP part number 1855-0298, it was made originally by USA mfg 02883 - > Siliconix, Inc, Santa Clara, CA. It crosses to NSN 5961-01-135-1324. And > Vishay has bought them and the part number is now obselete. > > ____________________________________________________________ > FREE 3D EARTH SCREENSAVER - Watch the Earth right on your desktop! > Check it out at http://www.inbox.com/earth > > > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. >

TM

Tom Miller

Wed, Apr 2, 2014 3:03 AM

Borrow Q108 (or any of the like devices) to test your hypothesis. It is just
used as a low leakage protection diode. You can replace Q108 with almost any
n-ch fet.

Tom

----- Original Message -----
From: "Tony Greene" tonygreen924@inbox.com
To: volt-nuts@febo.com
Sent: Tuesday, April 01, 2014 10:13 PM
Subject: [volt-nuts] FET HP3456A

I have been troubleshooting a HP3456A voltmeter.

Its giving a stange fault, but I beleive I have nailed it down. The unit
is reading +10.00000 volts input at +9.99661 volts. If you reverse the
input, it reads correct at -10.00000 volts. All other ranges read correct
on either polarity.

What I need is a source for the FET A20 Q109 or a suitable substitute.
Its HP part number 1855-0298, it was made originally by USA mfg 02883 -
Siliconix, Inc, Santa Clara, CA. It crosses to NSN 5961-01-135-1324. And
Vishay has bought them and the part number is now obselete.

FREE 3D EARTH SCREENSAVER - Watch the Earth right on your desktop!
Check it out at http://www.inbox.com/earth

volt-nuts mailing list -- volt-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.

Borrow Q108 (or any of the like devices) to test your hypothesis. It is just used as a low leakage protection diode. You can replace Q108 with almost any n-ch fet. Tom ----- Original Message ----- From: "Tony Greene" <tonygreen924@inbox.com> To: <volt-nuts@febo.com> Sent: Tuesday, April 01, 2014 10:13 PM Subject: [volt-nuts] FET HP3456A >I have been troubleshooting a HP3456A voltmeter. > > Its giving a stange fault, but I beleive I have nailed it down. The unit > is reading +10.00000 volts input at +9.99661 volts. If you reverse the > input, it reads correct at -10.00000 volts. All other ranges read correct > on either polarity. > > What I need is a source for the FET A20 Q109 or a suitable substitute. > Its HP part number 1855-0298, it was made originally by USA mfg 02883 - > Siliconix, Inc, Santa Clara, CA. It crosses to NSN 5961-01-135-1324. And > Vishay has bought them and the part number is now obselete. > > ____________________________________________________________ > FREE 3D EARTH SCREENSAVER - Watch the Earth right on your desktop! > Check it out at http://www.inbox.com/earth > > > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there.

volt-nuts@lists.febo.com

3455A ROMS